Electrical measuring instrument



Aug. 2t, 1927.

R. T. PIERCE ELECTRICAL MEASURING INSTRUMENT Filed Feb. 5, 1923 mvENToR Raymond T Poems.

. BY s/M an/v ATTORNEY F? .5, WITNESSES; 3 f g EGVL ' shape of the coil. V

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Patented Aug. Z, 1927 RAYMOND T. P1ERCE,O11 W LKINSBUR PATENT 0F PENNSYLVANIA, asslenon TO wrisrnve 1 1,537,390 FICE.

" HoUs'n'nLEoTRIo & 'MANUFACTUR-ING COMPANY, A'ooRroRA'rIoN or PENNSYIE I VANIA.

EL ECTRTCAL i MEASURING -I1.\lSTB.-UMENT.

Application filcd'February 3; 1923. Serial No. G16,736.

" My invention relatesto electrical measuring instruments and particularly to the movable elements thereof. i

One object ofmy invention is'to provide a device of the above indicated character that shall be simple and durable in construction,

economical. to manufacture and etfectivein' its operation. I n I Another object of my invention is to provide a simple means forclampingan instrue ment coil to a? shaft and for retaining the Another object of tlie invention is to provide a movable element for an electri-,

cal measuring instrun'ient that shall embody a novel combination conducting lead and spring-holdingstructure.

- A further object of my invent-ion is to provide a damping vane structure for an elec-' trical meter that shall be of such construction 3 and: so frictionally held in. position as 1 to. greatly. facilitate its assembly and to render the same durable in construction and effect ve in operation: I v

In practicing my invention, IPI'OVlClG a' coil; preferably of substantially oval shape,

that'is transversely divided to admit a meter shaft therethrougln Clamping mem bers are provided at the two points of intersection of the shaft with the coil, from one of which clampsa novel combination con ducting-lead and spring-holding'device eX- tends for a distance along'the shaft to a position adjacent to a dampingvane structure of novel constrnctionthat is frictionally mounted on the shaft. 1

Figure 1 of the'accompanying drawing is a top plan view of a meter element embody lead and spring-holding device 5 and a damping-vane structure 6. I e

The coil 2 is preferably wound to be of I substantially oval shape and ist-ransversely divided, as indicated by an opening 7, to admit the shaft 1 therethrough. I

' inwardlv lower en'dsyresp'ectively, that are "holding relation around tube .14. The

i The clamp 3 ispret'erably constructed of flat strap metal having a central opening portions 8 which are bent downwardly and around the outer lateral edges of rial 9 may be placed between the clamp 3 and tl'lGtOll 2. The above construction serves not only to firmly secure the coil to the shaft 1, but also serves to prevent the spreadingor separating of the turns ofthe coil 2.

' The clamp 4i, somewhat similar to the clamp 3 similarly provided withends 10 which surround the coil lover a sheet of insulatingmaterial 11, and is further proconstituting a portion of thedevice 5,extends. P n The device 5 further comprises a conducting strip 15 having laterally extending portions 16 and 17 adjacent to its u per and ent into portion 16 and a portion of the tube 14 extend into the sleeve 12 by which they are clamped in telescopic relation around the shaft 1. The strip 15 is also provided with a portion 18 ofsubstantially hook shape to whiohthe end of a spiral spring (not shown) may be suitably attachechas by clamping or solder the coil 2. Astrip of sheet insulating matei which surrounds the shaftl and outer end 'videdwith a slecve portion 12'into which a' cyl ndrical tube of insulating material 14,

The damping vane. structure 6 comprises i i a pair of diametrically opposite vanes 19 h aving reinforcing ridges 20 and laterally extending reinforcing perimetral flanges 21, portions of which extend beyond the inner endsof the vanes proper to provide holding portions 22 and 23.

The portions 22 are frictionally wedged or clamped between an annular member or cylinder 24:. and portions 25, of reduced diameter, of bushing 26 that is preferably press fitted on the shaft 1. The portions 23 are frictionally clamped or held in position between a portion of the cylinder 24 and portions 27, of reduceddiameter, of another cylinderQS that is telescopically related to the cylinder 24. n p

The arrangement of parts provides a novel meterelement that is compact, neat, simple and durable in construction and economical to manufacture, that facilitates the assembly of the instrument and that is effective in its operation. I

portion and said element, said elementhai ing outer end portions bentaround opposite edges of said coil portion and being adapted to secure the coil tothe shaft.

v, 2.-In an electrical measuring nstrument, .the combination wlth a shaft and a coil .mounted thereon, of -a body of insulating material extending from, the coil for. a distance along the shaft and a conducting lead extending along said body said lead having an integral portion in positlon. a

3. In an electricalmeasuring instrument,

{for mounting the same :the combination with'a shaft andfla' coil mounted thereon, ofa'body of insulating material extending from the coil for a distance along the shaft anda conducting lead extending alongsaid body having an inte-' gra-l portion for mounting the same in positionand a spring-receiving portion.

. 4. In-an electrical measuring instrument, the combination with a'shaft and a coil mounted thereon, of "a body of insulating" material extending from the coil for a distance along the shaft and aconducting lead extending along said body and having a laterally-projecting portion for holding the lead to said insulating body.

5. In an electrical measuring instrument,

the combination With a shaft and a coil mounted thereon, of an insulating tube surrounding and extending along the shaft for a distance from the coil and a conducting lead for the coil extending along and having a portion'extending around the outer surface of said tube.

6. In anelectrical measuring instrument, the combination with a shaft and a coil mountedthereon, of an insulating tube surrounding and extending along the shaft for a distance from the coil and a conducting lead for the coil extending along and hav ing a transverse portion bent around a portion of the tube. V

7. In an electrical measuring instrument, the combination with a shaft and a coil mounted thereon, of an insulating tube surrounding and extending along the shaft for distance from the' coil and a conducting lead for the coil extending along and having a transverse portion bent around a portion of the tube, said lead also having a portion. for clamping operative relationlo a spring. 7

r 8. In an electrical measuring instrument, the combination with a shaft, of a dampingvane structure comprising a bushing'on the shaft, a cylinder surrounding the-bushing anda vane member having portions clamped between the bushing and the cylinder.

9. In an electrical measuring instrument, the combination With-a shaft, ofa dampingvane structure comprisinga bushing on the shaft, a pair of telescopically related cylinders, aportion' of one of which surrounds the bushing, and a vane member having a portion-held in position between the bushing and said cylinder portion and a portion held in position between said cylinders.

In testimony ivliereoihI have hereunto subscribedimy name this 26th day of January, 1923. V

g V V RAYMOND T. PIERCE. 

